The Huey is a flyable vehicle in Unturned added in the 18.104.22.168 update. It is a military helicopter that can carry up to four people. If the Huey's rotors touch anything during flight, the Huey will explode, damaging any entity inside, or near it.
It is currently available in two variants: desert and forest.
Pitch and roll are controlled with the mouse. Moving the mouse forward/back will cause the Huey to pitch (tilt) nose down/nose up respectively. Pitch direction can be inverted in the options. Moving the mouse left/right will cause the Huey to roll (tilt sideways) left/right respectively. This represents the "cyclic" in a real helicopter.
Yaw is controlled with the strafe/steering buttons (Default: A/D). Yaw is a left/right spinning movement about the main rotor mast. Pressing A/D will cause the Huey to spin left/right respectively. This represents the "anti-torque pedals" in a real helicopter.
Altitude/Throttle is controlled with the forward/reverse buttons (Default: W/S). Pressing W will cause the Huey to go up. When taking off from the ground there is a delay before liftoff while the engine throttles up. Pressing S will throttle the engine down, but does not appear to accelerate downward motion. This represents both the "collective" and "throttle" in a real helicopter.
"Huey" is a common nickname given to the UH-1 "Iroquois", the real life helicopter that the in-game Huey is based off.
In Unturned the player controlling the Huey sits in the left side seat. But in a real Huey, and most other North American helicopters, the pilot/captain sits in the right side seat.
The Huey is apparently controlled by a yoke (airplane steering wheel). Most helicopters, including the UH-1 "Iroquois" the Huey is based upon, are controlled with joystick and lever controls known as a cyclic and collective respectively.
When the player yaws the Huey (spinning left/right) their character is seen to be turning the yolk. In a real helicopter yawing is preformed with pedals.
The Huey reaches it's top cruising speed at or near a 45° nose down attitude. Real helicopters stay relatively level at any given speed (Though they may temporarily adopt extreme nose down attitudes in order to accelerate quickly).